Mechanism of Respiration Quiz
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Questions and Answers

What happens to the thoracic cavity during inspiration?

  • Moves downward
  • Decreases in size
  • Remains unchanged
  • Increases in size (correct)

    • What occurs when the diaphragm relaxes during expiration?

  • Air rushes in
  • Volume of the thoracic cavity decreases (correct)
  • Lungs expand
  • Pressure within the thoracic cavity decreases

    • How does air enter the lungs during inspiration?

  • Due to decreased size of the thoracic cavity
  • Due to decreased pressure inside the thoracic cavity (correct)
  • Due to relaxation of the diaphragm
  • Due to increased pressure inside the thoracic cavity

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